﻿/*
Copyright (c) 2013, Marc Tanti
All rights reserved.

Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:

* Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
* Neither the name of the www.marctanti.com nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using MARIA.program.statement;
using MARIA.program.condition;

namespace MARIA.program.statementfactory
{
    /// <summary>
    /// Factory for IfStatement.
    /// </summary>
    public class IfFactory : StatementFactory
    {

        /// <summary>
        /// Get singleton instance.
        /// </summary>
        public static IfFactory Instance
        {
            get
            {
                if (instance == null)
                {
                    instance = new IfFactory();
                }
                return instance;
            }
        }
        private static IfFactory instance = null;

        /// <summary>
        /// Initialize a new instance of IfFactory.
        /// </summary>
        private IfFactory()
            : base("IF", "Execute the statements inside the IF statement only if the condition is met.", Properties.Resources.statement_if)
        {
        }

        /// <summary>
        /// Make a default instance of IfStatement.
        /// </summary>
        /// <returns>A new instance.</returns>
        public override Statement MakeInstance()
        {
            return new IfStatement();
        }

        /// <summary>
        /// Check if a structured text description of the statement matches the statement this factory produces (used to instantiate statements from text file content).
        /// </summary>
        /// <param name="description">The description.</param>
        /// <returns>If the description is a match.</returns>
        public override bool IsDescriptionValid(string description)
        {
            return description.StartsWith("IF ");
        }

        /// <summary>
        /// Make a description based instance of MoveUpStatement.
        /// </summary>
        /// <param name="description">The description, which in this case happens to not matter as MoveUpStatement cannot be parameterized.</param>
        /// <returns>A new instance.</returns>
        public override Statement MakeInstance(string description)
        {
            return new IfStatement(new Condition(description.Substring(3)));
        }

    }
}
